The third module addresses internal stability. Here, the spreadsheet calculates the tensile forces at each reinforcement level and the required pullout length. Advanced spreadsheets utilize macros or scripting to optimize reinforcement spacing—perhaps suggesting closer spacing near the top of the wall where surcharge loads are high, or increasing reinforcement length at the base to improve bearing capacity.
The spreadsheet calculates if the entire reinforced soil mass acts as a coherent gravity unit. It checks against sliding, bearing capacity failure, and overturning (eccentricity).
: Evaluates the driving moments against the resisting moments around the toe of the wall.
If safety factors are below code requirements (typically mse wall design spreadsheet
If the project is in a high-risk zone, the tool must incorporate Mononobe-Okabe equations.
: High-quality sheets (like those from PennDOT or FDOT) are pre-configured with the latest LRFD load factors (e.g., 1.35 for traffic surcharge in some contexts).
Toggle between Allowable Stress Design (ASD, factors of safety) and Load and Resistance Factor Design (LRFD, φ factors and load factors). Some spreadsheets include separate tabs for Strength I, Strength IV, Service I, and Extreme Event I (seismic). The third module addresses internal stability
Incorporate horizontal and vertical seismic coefficients (
Outside, the construction site for the new Riverview Logistics Hub sat dormant. But in five days, the subcontractor would arrive with 2,000 tons of select granular backfill and a fleet of screeching compactors. Without an approved MSE wall design, the whole project would grind to a halt.
If any check fails, the spreadsheet suggests adjustments (e.g., increasing ( L )) and recalculates automatically. The spreadsheet calculates if the entire reinforced soil
An effective MSE wall design spreadsheet must incorporate regional design methodologies. Most modern infrastructure projects rely on one of two standards: 1. AASHTO LRFD (Load and Resistance Factor Design)
(Sliding SF: 1.68, Overturning: 2.1, Bearing: 1.82) Internal Stability: PASS (Maximum geogrid tension: 22 kN/m < 45 kN/m allowable) Critical Layer: 8 (4.0 m depth) — Pullout governs Recommended reinforcement length: 4.65 m (0.75H)